Add native permissions dialog for apps_devtools app.

chrome/common/extensions/api/developer_private.idl

Index: chrome/common/extensions/api/developer_private.idl
diff --git a/chrome/common/extensions/api/developer_private.idl b/chrome/common/extensions/api/developer_private.idl
index ec6084e37b09d546d6bb7214d84d0c65eb3fb756..edd7b200ee8ebf255f760ef8464d6297e0a75e83 100644
--- a/chrome/common/extensions/api/developer_private.idl
+++ b/chrome/common/extensions/api/developer_private.idl
@@ -120,6 +120,10 @@ namespace developerPrivate {
                              boolean include_terminated,
                              ItemsInfoCallback callback);
 
+    // Opens a permissions dialog for given |itemId|.
+    static void showPermissionsDialog(DOMString itemId,
+                                      optional VoidCallback callback);
+
     // Opens an inspect window for given |options|
     static void inspect(InspectOptions options,
                         optional VoidCallback callback);